Two lines $1x−3 =3y+1 =−1z−6 $ and $7x+5 =−6y−2 =4z−3 $ intersect in point R. The reflection of R in the xy-plane has coordinates: (a) $(2,−4,−7)$ (b) $(2,4,7)$ (c) $(2,−4,7)$ (d) $(−2,4,7)$

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